A5053358578- Cultural Heritage Materials Analysis
- Physics of Superconductivity and Magnetism
- Conservation Techniques and Studies
- Building materials and conservation
- Superconductivity in MgB2 and Alloys
- X-ray Spectroscopy and Fluorescence Analysis
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- X-ray Diffraction in Crystallography
- Superconducting Materials and Applications
- Electron and X-Ray Spectroscopy Techniques
- Diamond and Carbon-based Materials Research
- Nuclear Physics and Applications
- Electronic and Structural Properties of Oxides
- High-pressure geophysics and materials
- Boron and Carbon Nanomaterials Research
- Iron-based superconductors research
- ZnO doping and properties
- Magnetic Properties of Alloys
- Superconducting and THz Device Technology
- Mineralogy and Gemology Studies
- Image Processing and 3D Reconstruction
- Surface and Thin Film Phenomena
- Archaeological Research and Protection
- Copper Interconnects and Reliability
University of Turin
2015-2024
National Interuniversity Consortium of Materials Science and Technology
2012-2021
Torino e-district
2015-2018
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2016
National Interuniversity Consortium for the Physical Sciences of Matter
2008-2012
Istituto Nazionale per la Fisica della Materia
2000-2006
Prometeia (Italy)
2003
The use of ultraviolet and visible diffuse reflectance spectrophotometry as a preliminary technique in the investigation illuminated manuscripts is discussed. Because ancient are amongst most fragile precious artworks, characterisation materials used their decoration should be performed using non-invasive analytical methods. Ultraviolet with optical fibres (FORS) allows identification several colourants by illuminators, causing no damage or mechanical stress to artworks subjected analysis....
A totally non-invasive procedure has been developed for differentiation of natural and synthetic ultramarine blue pigments on the basis collection UV-visible spectra in diffuse reflectance mode, followed by a chemometric treatment data using unsupervised pattern recognition methods. The main spectral features paint samples, i.e. reflection maxima, inflection points minima, could not be useful enough process; threshold 455 nm comparison maxima observed, with samples peaking lower than this...
X-ray fluorescence spectroscopy is a non-destructive technique employed for elemental analysis of wide range materials. Its advantages are especially valued in archaeometry, where portable instruments available. Considering ancient glass, such allow the detection some major, minor, and trace elements linked to deliberate addition specific components or impurities raw materials glass batch. Besides undoubted advantages, XRF (p-XRF) has limitations that addressed this study. The performance...
Abstract An ancient religious manuscript datable to the 4th century A.D., Codex Eusebii Evangeliorum or Vercelli Gospels , has been analysed by portable Raman and x‐ray fluorescence (XRF) spectrometry. The belongs Cathedral Treasure Museum of (Italy) is reputed be oldest existent copy written in Latin, being therefore particular relevance biblical scholars. Red black inks were characterised: minium cinnabar identified red text, carbon metal gallate text. Moreover, XRF spectrometry allowed...
We describe the controlled use of a 17 keV X-ray synchrotron nanobeam to progressively change oxygen doping level in Bi-2212 superconducting whisker-like single crystals. Our data combine structural and electrical information collected on same crystals, showing maximum critical temperature Tc 1.3 K elongation ∼1 Å c-axis length, compared as-grown conditions. Simulations our experimental conditions by means finite element model exclude local heating induced as possible cause for suggest an...
Abstract An unusual metallic pigment was identified on an ancient Italian manuscript containing the Homilies Gospels of Gregory Great, belonging to Archive and Chapter Library Vercelli (Italy) datable IX century. Green uncial text part decoration this were described as ‘being golden fashion’ in a book written at beginning XX Investigations carried out with portable XRF Raman instruments revealed that green colouration is actually result marked degradation process has altered original...
Direct evidence of oxygen doping control in single phase Bi2Sr2CaCu2O8+δ (Bi-2212) whiskers is reported, along with the changes their structural properties obtained by varying growth temperature synthesis process range from 843 to 872 °C. The as-grown were investigated means x-ray powder diffraction (XRPD), electrical transport measurements, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). XRPD measurements showed that value c-axis lattice parameter increases...
We studied magnetic flux penetration in a hybrid MgB2/Fe structure consisting of two coaxial cups field applied parallel to their axis. This analysis was performed investigate the potential shielding systems with reduced length/radius aspect ratio exploiting opposite properties superconducting and ferromagnetic materials. measured attenuation for fields up 1.5 T, different positions along cup At higher fields, solution gives factors more than three four times those MgB2 alone at T = 20 30 K,...
In the past few years, strong efforts have been devoted to improving frequency of optical-fiber communications. particular, use a special kind integrated optoelectronic device called an electroabsorption modulated laser (EML) allows communication at 10 Gb s−1 or higher over long propagation spans (up 80 km). Such devices are realized using selective area growth (SAG) technique and based on multiple quantum well (MQW) distributed-feedback (DFB) monolithically with MQW modulator (EAM). Since...
In this paper we investigate and compare the shielding properties of superconducting hybrid superconducting/ferromagnetic systems, consisting cylindrical cups with an aspect ratio height/radius close to unity. First, reproduced, by finite-element calculations, induction magnetic field values measured along symmetry axis in a (MgB2) configuration (MgB2/Fe) as function applied position. The calculations are carried out using vector potential formalism, taking into account simultaneously...
Three commercial powders of MgB2 were tested in vitro by MTS and LDH cytotoxicity tests on the HS27 dermal cell line. Depending powders, toxicity concentrations established range 8.3-33.2 µg/ml. The powder with lowest limit was embedded into polyvinylpyrrolidone (PVP), a biocompatible biodegradable polymer, for two different concentrations. self-replenishing MgB2-PVP composite materials coated substrate (plastic foil reservoir silicon tubes) composing urinary catheter. influence...
We present an analytical method allowing to quantitatively extract, from a space resolved Synchrotron Radiation X-Ray Fluorescence (SR-XRF) map, the variation of thickness and chemical composition In1−xGaxAs ternary semiconductor film, in which gradient growth plane both is obtained using Selective Area Growth (SAG) method. This advanced technique allows realization monolithic integrated laser/modulator devices for long distance fiber optics communication at high frequency, have recently...
We investigated the efficiency in magnetic field mitigation of superimposed MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /Fe coaxial cups with cylindrical symmetry, subjected to an applied parallel their axis. The cup was grown by a microwave-assisted Mg-liquid infiltration technique boron preform. This allows obtaining samples reduced amount unreacted magnesium, shape chosen before growth procedure, and easily scalable sizes....
A 14th-century breviary known as Breviario di San Michele della Chiusa, produced at the disposal of monks Sacra abbey (near Turin, Italy) has been analysed in order to identify different authors who contributed its making. The study aimed revealing how many scribes composed text and musical notations artists worked for miniatures decorations initials. All inks decorative features have by means portable X-ray fluorescence spectrometry determining elemental distribution ultraviolet–Visible...
We describe the first use of a novel photoresist-free X-ray nanopatterning technique to fabricate an electronic device. have produced proof-of-concept device consisting few Josephson junctions by irradiating microcrystals Bi2Sr2CaCu2O8+δ (Bi-2212) superconducting oxide with 17.6 keV synchrotron nanobeam. Fully functional devices been obtained locally turning material into nonsuperconducting state means hard exposure. Nano-XRD patterns reveal that crystallinity is substantially preserved in...
Unconventional in situ synthesis of MgB2 undoped and doped with fullerene (C60) was performed by using a single-mode microwave (MW) furnace. Structural properties suggested that C substitutes for B the crystal lattice MgB2, while Jc showed typical enhancement at high magnetic fields when chemical doping occurred. This behavior similar to published results another field-activated unconventional method processing, i.e., spark plasma sintering, it opposite conventional powder-in-tube which...